Răspuns :
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a bcd = nr. par , Suma a bcd= ?
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a= 1
c= d+ 2
b=( c+ d): 2
5 < ( a+ b+ c+ d) < 20
1. pt. d= 0 2. pt. d= 2 3. pt. d= 4
c= 0+ 2 c= 2+ 2 c= 2+ 4
c= 2 c= 4 c= 6
b=(2+0): 2 b=(4+2): 2 b=(6+ 4): 2
b= 2:2 b= 6: 2 b=10: 2
b= 1 b= 3 b= 5
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a bcd = 1 120 a bcd= 1 342 a bcd= 1 564
5 < 1+1+2+0< 20 5 < 1+3+4+2< 20 5 < 1+5+6+4< 20
5 < 4 < 20 F 5 <10 < 20 A 5 < 16 < 20 A
4. pt. d= 6 Suma nr. pare: 1 342+ 1 564= 2 906
c=6+2
c= 8
b=(6+ 8): 2
b=14:2
b= 7
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a bcd= 1 786
5 < 1+ 7+ 8+ 6 < 20
5 < 22 < 20 F